Which of the following is a primary goal of the precorneal tear film?

The primary goal of the precorneal tear film is to provide oxygen and moisture to the eye. The tear film is essential for maintaining the health of the cornea, which does not have its own blood supply. The tear film works by delivering oxygen directly to the corneal surface from the air and helps maintain a moist environment, which is crucial for optimal corneal function and vision. This moisture prevents dryness and irritation, ensuring that the cornea remains transparent and healthy.

While lubricating the eyelids, protecting the cornea from pathogens, and preventing irritation during blinking are important functions of the tear film, they are secondary to its primary role of providing essential oxygen and moisture to the eye. The overall health and well-being of the eye depend on the correct balance of these components, making moisture and oxygen delivery vital for sustained eye function.